EP2287925B1 - Dispositif semiconducteur optoélectronique compensé pour la dilatation, en particulier diode émettant dans l'UV - Google Patents

Dispositif semiconducteur optoélectronique compensé pour la dilatation, en particulier diode émettant dans l'UV Download PDF

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Publication number
EP2287925B1
EP2287925B1 EP10177644.1A EP10177644A EP2287925B1 EP 2287925 B1 EP2287925 B1 EP 2287925B1 EP 10177644 A EP10177644 A EP 10177644A EP 2287925 B1 EP2287925 B1 EP 2287925B1
Authority
EP
European Patent Office
Prior art keywords
housing
glass
lead frame
light
chip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP10177644.1A
Other languages
German (de)
English (en)
Other versions
EP2287925A2 (fr
EP2287925A3 (fr
Inventor
Günter Waitl
Alfred Langer
Reinhard Weitzel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osram GmbH
Ams Osram International GmbH
Original Assignee
Osram Opto Semiconductors GmbH
Osram GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Osram Opto Semiconductors GmbH, Osram GmbH filed Critical Osram Opto Semiconductors GmbH
Publication of EP2287925A2 publication Critical patent/EP2287925A2/fr
Publication of EP2287925A3 publication Critical patent/EP2287925A3/fr
Application granted granted Critical
Publication of EP2287925B1 publication Critical patent/EP2287925B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
    • H10F77/00—Constructional details of devices covered by this subclass
    • H10F77/50—Encapsulations or containers
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H10H20/8506—Containers
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
    • H10W90/00—Package configurations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20—Light sources comprising attachment means
    • F21K9/23—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
    • F21K9/232—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H10H20/851—Wavelength conversion means
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H10H20/858—Means for heat extraction or cooling
    • H10H20/8581—Means for heat extraction or cooling characterised by their material
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
    • H10W72/00—Interconnections or connectors in packages
    • H10W72/30—Die-attach connectors
    • H10W72/321—Structures or relative sizes of die-attach connectors
    • H10W72/325—Die-attach connectors having a filler embedded in a matrix
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
    • H10W72/00—Interconnections or connectors in packages
    • H10W72/30—Die-attach connectors
    • H10W72/351—Materials of die-attach connectors
    • H10W72/352—Materials of die-attach connectors comprising metals or metalloids, e.g. solders
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
    • H10W74/00—Encapsulations, e.g. protective coatings
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
    • H10W90/00—Package configurations
    • H10W90/701—Package configurations characterised by the relative positions of pads or connectors relative to package parts
    • H10W90/751—Package configurations characterised by the relative positions of pads or connectors relative to package parts of bond wires
    • H10W90/756—Package configurations characterised by the relative positions of pads or connectors relative to package parts of bond wires between a chip and a stacked lead frame, conducting package substrate or heat sink

Definitions

  • the invention relates to an expansion-compensated optoelectronic module according to claim 1. It is a module with a light-emitting diode which emits in the range of 320 to 400 nm, with luminescence conversion into white light.
  • the semiconductor used is usually a nitride of gallium and / or indium and / or aluminum.
  • An optoelectronic semiconductor component such as a light-emitting diode is limited in its application, without this deficiency is so perceived by the experts so far.
  • plastic is ideally suited as a housing material, as it can be easily processed. Cast resin technology with epoxy is widely used.
  • the current use of a plastic housing limits the working temperature to the range of -55 ° C to +110 ° C.
  • white light-emitting light-emitting diodes For the production of white light for general lighting purposes, white light-emitting light-emitting diodes have recently come into question. They are based on the generation of white light by means of a blue or UV-emitting light-emitting diode. Conventional implementation concepts are based on radial designs that are suitable for through-hole mounting (for example, the so-called LUCOLED design) or SMT-compatible designs, the so-called top-mounted design for surface mounting (SMT LED). More details can be found for example in the article " White-light diodes are set to tumble in price "by Philip Hill, OLE October 1997, pages 17 to 20 , In the LUCOLED concept, for example, a blue emitter based on GaN generates white light by means of luminescence conversion.
  • the publication WO 97/48134 A1 relates to a lighting device with multiple LEDs.
  • a solid-state light source has a housing with materials with matched coefficients of thermal expansion.
  • the publication DE 196 25 622 A1 discloses a light-emitting semiconductor device with a radiation-emitting semiconductor body with at least two electrical connections and with a luminescence conversion element.
  • the radiation is z.
  • Mixed-color light, in particular white light, can be generated with the semiconductor component.
  • the publication JP H06-041017 U is directed to a display with LEDs.
  • the present invention is a module in which a radiation-emitting semiconductor body is mounted on an electrically conductive lead frame and surrounded by a gas-tight housing. All the housing materials used and the leadframe exhibit coefficients of thermal expansion adapted to one another in the temperature range which occurs in production and application.
  • the housing has a base body with a recess, wherein the base body is attached to the lead frame gas-tight.
  • the semiconductor chip is mounted in the recess on the lead frame.
  • the recess is sealed gas-tight with a separate cover.
  • the base body and the cover are made of glass or quartz glass or ceramic or glass ceramic.
  • the individual materials are optimally matched in the temperature range from -60 ° C to 150 ° C.
  • the junction temperature T J can be increased from currently 100 ° C to 130 ° C and more.
  • LEDs can be used outdoors up to an ambient temperature of about 100 ° C, making them suitable for automotive applications or outdoor information systems.
  • the module according to the invention has the advantage that conventional methods of attachment under high temperature conditions for the semiconductor chip on the lead frame can be applied. Due to the temperature sensitivity of plastic, this is not possible with the currently used plastic housings. Instead, conductive adhesives containing, for example, Ag are used here.
  • Another advantage of the module according to the invention is that a higher stability is achieved because boundary layer effects between semiconductor chip and Plastic wrapping are excluded. Delamination does not occur in long-term operation or during soldering, so that the light extraction is stabilized.
  • a particular advantage of the present invention is that for the first time in principle it is possible to provide a UV-emitting light-emitting diode which has a high luminous efficacy and efficiency and which can be produced inexpensively. This is not only due to the basic production-friendly design, but also because of the materials that are now being used, there are also those with high transparency in UV and resistance to UV radiation, for example quartz glass. For plastics, this requirement is virtually impossible to meet.
  • the lead frame consists of known copper sheath wire.
  • Copper sheathed wire is understood to mean a wire whose core consists of a Ni-Fe alloy and whose sheath is made of copper.
  • Particularly suitable are organic or inorganic adhesives, for example water glass.
  • the cover on the frame part sits for example over a large area over the surface of the frame including the recess or is positioned only in the region of the recess.
  • low-melting glass is used as the material for the housing, advantageously soft glass, in particular lead glass or alkali glass. It is typically processable from 400 ° C.
  • the thermal expansion coefficient is about 8 to 11 x 10 -6 / K.
  • the difference between the thermal expansion coefficients of individual parts of the housing is not greater than +/- 15%.
  • the above components are well matched to each other, for example, when used as a lead frame or metal feedthrough a fused alloy of the type VACOVIT or VACON or VACODIL. These contain Ni, Fe as main constituents of the alloy to which Cr or Co may be added (also suitable for ceramics).
  • a pre-punched conductor strip can be applied with pressed glass parts or sintered glass parts, which are then glued together. Or, individual pieces are cut from a glass blank (rod), brought into contact with the lead frame, heated and molded. In this way, the lead frame is embedded directly into the housing and the individual parts of the housing are fused together.
  • a socket / cap structure can be realized in one piece. Often, however, it is production-friendly to realize this construction in two parts, with a fusion or gluing (for example silicone adhesive) also being considered here.
  • a fusion or gluing for example silicone adhesive
  • the concept according to the invention is outstandingly suitable for the creation of an LED-based lamp or luminaire as a replacement bulb.
  • it is intended for a surface light, which is composed of several LEDs as individual pixels of an array of several rows and columns.
  • the individual pixels are controlled separately electronically.
  • the surface light can be used not only as a light source but also partially (for example, a row of the array) or entirely as an information medium by LEDs form a pictogram or the like.
  • Another implementation is a spherical lamp having a feed rod inside, with several individual pixels grouped around the rod.
  • a surface lamp can be produced so that a number of basic elements (individual pixels), which are combined to form a lamp, fully assembled or partially assembled without cover or without lens on a flat substrate (carrier) are applied and interconnected. They are surrounded by a common outer housing. Any luminescence conversion can be realized here by a common cover. As a result, an extremely flat design can be achieved.
  • the surface of the carrier can also be arbitrarily shaped, for example as Ball or rod (see above). Since the base element is a semiconductor component, the required control electronics can be integrated on the same substrate, for example by screen printing or SMT. Dimming is also possible over a wide range. Areal lamps can be produced by direct chip mounting in multi-chip packages produced according to the invention.
  • modules are also possible which generate white light through three individual components (red, green, blue).
  • this also a targeted infinitely variable adjustment of the color temperature is possible.
  • reference is made to a basic unit with white light which is further admixed with individual components which contribute red or blue components for lowering or increasing the color temperature.
  • FIG. 1 is a not inventive light-emitting diode 1 shown in section ( Figure 1A ) and plan view ( FIG. 1B ). It has a semiconductor chip 2, which is fastened on a leadframe 3.
  • the chip 2 is electrically conductively connected to two electrode terminals 5 which are passed through a bottom part 4 and which are components of the leadframe.
  • a contact wire 6 causes the connection of the chip 2 to the one electrode terminal 5a, while the electrical connection to the other electrode terminal 5b is accomplished by bonding the electrically conductive bottom surface of the chip to the support surface integrally formed with the electrode terminal 5b.
  • the lens 7 provided for optical imaging of the chip is designed as an upper end part of a hollow-cylindrical cap 8.
  • the cap 8 surrounds a substantial part of the bottom part 4.
  • the bottom part as well as the cap are made, for example, of lead glass of the following composition: SiO 2 60-65% by weight; PbO 20-22% by weight; K 2 O 4-10% by weight; Na 2 O 4-7% by weight.
  • Another lead glass has the composition SiO 2 46-50% by weight; PbO 37-42% by weight; K 2 O 0.5-5% by weight; Na 2 O 7-13% by weight; Al 2 O 3 0-2% by weight.
  • FIG. 2A shows a non-inventive modification of a light-emitting diode in Topled design.
  • the lead frame 10 consists of two metallic bands 11, one of which is equipped in a conventional manner with the chip 12.
  • a contact wire 13 connects the chip 12 to the second band.
  • the housing consists here of a cuboid bottom part 14 which is glued from below to the lead frame 10.
  • a rectangular frame part 15 is fastened on the ladder frame 10 from above.
  • a cover 16 is required, which closes the frame part upwards and advantageously has optical properties.
  • FIG. 2B is a chip carrier tape 18, consisting of a plurality of interconnected lead frames for producing an optoelectronic semiconductor device shown.
  • FIG. 3 a section of a surface light 20 is shown. It consists of a common carrier 21, to which a cuboid outer housing 22 is glued. Its upper side is provided with a common cover 23.
  • the cuboid housing has recesses in which individual semiconductor devices 24 are housed. They are UV-emitting LEDs.
  • the conversion to white light takes place by means of conversion layers 25 which are applied to all surfaces accessible to UV radiation. These include the inside surfaces of the side walls of the housing, the cover and the bottom part.
  • the individual pixels are similar as in FIG. 2 shown constructed.
  • FIG. 4 An example of a not according to the invention, compact lamp 30 based on light-emitting diodes is in FIG. 4 shown. It is similar to externally known lamps in which a spherical outer bulb 31 is seated on a screw base 32 as the outer housing.
  • the base 32 carries a round rod 33 which extends far into the outer bulb 31 in.
  • the round rod 33 forms a carrier which is equipped on its surface with light-emitting diodes 34. Inside the round rod 33, the electronics 35 is hidden.
  • the outer bulb 31 is covered inside with a conversion layer 36.
  • the light-emitting diodes emit, for example, UV or blue light.

Landscapes

  • Led Device Packages (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Light Receiving Elements (AREA)

Claims (1)

  1. Module optoélectronique avec :
    - un module de base qui émet une lumière blanche qui est générée á partir d'un rayonnement UV émis par une puce semi-conductrice dans une plage allant de 320 à 400 nm au moyen d'une conversion par luminescence, et
    - au moins un autre composant qui mélange des parts rouges et/ou bleues pour augmenter voire diminuer la température de la couleur, le module de base et les autres composants individuels étant entourés d'un boîtier multipuce (22) et la différence entre les coefficients de dilatation thermiques de chacune des pièces du boîtier multipuce (22) n'est pas supérieure à +/- 15 %, de sorte que tous les matériaux de boîtier utilisés comportent, dans la plage de température qui se produite lors de la fabrication et de l'utilisation, des coefficients de dilatation thermiques ajustés les uns aux autres,
    le boîtier multipuce (22) étant constitué d'un corps de base avec un évidement et un couvercle (23), chacun étant en verre ou en verre de quartz ou en céramique ou en vitrocéramique, et d'un cadre conducteur composé d'une gaine en cuivre, et le corps principal étant fixé de manière étanche au gaz sur le cadre conducteur, la puce semi-conductrice étant fixée dans l'évidement sur le cadre conducteur et l'évidement étant fermé de manière étanche au gaz avec le couvercle.
EP10177644.1A 1998-01-30 1999-01-18 Dispositif semiconducteur optoélectronique compensé pour la dilatation, en particulier diode émettant dans l'UV Expired - Lifetime EP2287925B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803936A DE19803936A1 (de) 1998-01-30 1998-01-30 Ausdehnungskompensiertes optoelektronisches Halbleiter-Bauelement, insbesondere UV-emittierende Leuchtdiode und Verfahren zu seiner Herstellung
EP99100385.6A EP0933823B1 (fr) 1998-01-30 1999-01-18 Unité d'éclairage de surface avec un dispositif semiconducteur optoélectronique compensé pour la dilatation

Related Parent Applications (3)

Application Number Title Priority Date Filing Date
EP99100385.6A Division-Into EP0933823B1 (fr) 1998-01-30 1999-01-18 Unité d'éclairage de surface avec un dispositif semiconducteur optoélectronique compensé pour la dilatation
EP99100385.6A Division EP0933823B1 (fr) 1998-01-30 1999-01-18 Unité d'éclairage de surface avec un dispositif semiconducteur optoélectronique compensé pour la dilatation
EP99100385.6 Division 1999-01-18

Publications (3)

Publication Number Publication Date
EP2287925A2 EP2287925A2 (fr) 2011-02-23
EP2287925A3 EP2287925A3 (fr) 2012-04-18
EP2287925B1 true EP2287925B1 (fr) 2018-06-06

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ID=7856346

Family Applications (2)

Application Number Title Priority Date Filing Date
EP10177644.1A Expired - Lifetime EP2287925B1 (fr) 1998-01-30 1999-01-18 Dispositif semiconducteur optoélectronique compensé pour la dilatation, en particulier diode émettant dans l'UV
EP99100385.6A Expired - Lifetime EP0933823B1 (fr) 1998-01-30 1999-01-18 Unité d'éclairage de surface avec un dispositif semiconducteur optoélectronique compensé pour la dilatation

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Application Number Title Priority Date Filing Date
EP99100385.6A Expired - Lifetime EP0933823B1 (fr) 1998-01-30 1999-01-18 Unité d'éclairage de surface avec un dispositif semiconducteur optoélectronique compensé pour la dilatation

Country Status (7)

Country Link
US (1) US20010045573A1 (fr)
EP (2) EP2287925B1 (fr)
JP (1) JPH11289098A (fr)
KR (1) KR19990068209A (fr)
CA (1) CA2260389A1 (fr)
DE (1) DE19803936A1 (fr)
TW (1) TW451500B (fr)

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JPH11289098A (ja) 1999-10-19
EP0933823A2 (fr) 1999-08-04
EP0933823A3 (fr) 2004-05-12
EP2287925A2 (fr) 2011-02-23
DE19803936A1 (de) 1999-08-05
US20010045573A1 (en) 2001-11-29
EP0933823B1 (fr) 2018-08-29
TW451500B (en) 2001-08-21
CA2260389A1 (fr) 1999-07-30
EP2287925A3 (fr) 2012-04-18
KR19990068209A (ko) 1999-08-25

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